Histology NBME Exam Questions with 100% Correct Answers

Defines cardiac muscle: Correct Answer Connected by intercalated discs and composed of branched cells No conn. tissue Three layers of cerebellum: Correct Answer Inner: Granular layer Middle: Purkinje cells Outer: Molecular layer Derived from cytoplasm of megakaryocytes: Correct Answer Platelets/thrombocytes 9+2 arrangement of microtubules: Correct Answer Cilia and axonemes Needed for muscle contraction of skeletal muscle: Correct Answer Ca2+ and ATP Supporting cell of CNS - Oligodendrocytes function: Correct Answer neuroglia, provide support and insulation to axons in CNS. Supporting cell of CNS-Microglia function: Correct Answer resident macrophage cell, acts as first and main form of active immune defence in CNS. Supporting cell of CNS- Astrocyte function: Correct Answer astroglia, star shaped in brain and spinal cord. They provide; -Biochemical support to endothelial cells -Contribute to blood brain barrier -Nutrients to nervous tissue -Maintenance of extracellular ion balance -Repair in scarring process Supporting cell of CNS- Ependymal cell function: Correct Answer Thin neuroectodermal lining of ventricular system of brain and central canal of spinal cord. Involved in production of cerebrospinal fluid. Supporting cell of PNS- Schwann cell function: Correct Answer neurolemmocytes, principal glia of pns. Support neurons